1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995, 1996, 1997, 1998 by Ralf Baechle and Andreas Busse
*
* Jazz family specific interrupt stuff
*
* To do: On Jazz machines we remap some non-ISA interrupts to ISA
* interrupts. These interrupts should use their own vectors.
* Squeeze the last cycles out of the handlers. Only a dead
* cycle is a good cycle.
*/
#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/jazz.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
/*
* jazz_handle_int: Interrupt handler for the ACER Pica-61 boards
*/
.set noreorder
NESTED(jazz_handle_int, PT_SIZE, ra)
.set noat
SAVE_ALL
CLI
.set at
/*
* Get pending interrupts
*/
mfc0 t0,CP0_CAUSE # get pending interrupts
mfc0 t1,CP0_STATUS # get enabled interrupts
and t0,t1 # isolate allowed ones
andi t0,0xff00 # isolate pending bits
beqz t0,3f
sll t0,16 # delay slot
/*
* Find irq with highest priority
* FIXME: This is slow - use binary search
*/
la t1,ll_vectors
1: bltz t0,2f # found pending irq
sll t0,1
b 1b
subu t1,PTRSIZE # delay slot
/*
* Do the low-level stuff
*/
2: lw t0,(t1)
jr t0
nop # delay slot
END(jazz_handle_int)
ll_sw0: li s1,~IE_SW0
mfc0 t0,CP0_CAUSE
and t0,s1
mtc0 t0,CP0_CAUSE
PANIC("Unimplemented sw0 handler")
ll_sw1: li s1,~IE_SW1
mfc0 t0,CP0_CAUSE
and t0,s1
mtc0 t0,CP0_CAUSE
PANIC("Unimplemented sw1 handler")
ll_local_dma: li s1,~IE_IRQ0
PANIC("Unimplemented local_dma handler")
ll_local_dev: lbu t0,JAZZ_IO_IRQ_SOURCE
#if PTRSIZE == 8 /* True 64 bit kernel */
dsll t0,1
#endif
.set reorder
LONG_L t0,local_vector(t0)
jr t0
.set noreorder
/*
* The braindead PICA hardware gives us no way to distinguish if we really
* received interrupt 7 from the (E)ISA bus or if we just received an
* interrupt with no findable cause. This sometimes happens with braindead
* cards. Oh well - for all the Jazz boxes slots are more or less just
* whistles and bells and we're aware of the problem.
*/
ll_isa_irq: lw a0, JAZZ_EISA_IRQ_ACK
jal do_IRQ
move a1,sp
j ret_from_irq
nop
/*
* Hmm... This is not just a plain PC clone so the question is
* which devices on Jazz machines can generate an (E)ISA NMI?
* (Writing to nonexistent memory?)
*/
ll_isa_nmi: li s1,~IE_IRQ3
PANIC("Unimplemented isa_nmi handler")
/*
* Timer IRQ - remapped to be more similar to an IBM compatible.
*
* The timer interrupt is handled specially to ensure that the jiffies
* variable is updated at all times. Specifically, the timer interrupt is
* just like the complete handlers except that it is invoked with interrupts
* disabled and should never re-enable them. If other interrupts were
* allowed to be processed while the timer interrupt is active, then the
* other interrupts would have to avoid using the jiffies variable for delay
* and interval timing operations to avoid hanging the system.
*/
ll_timer: lw zero,JAZZ_TIMER_REGISTER # timer irq cleared on read
li s1,~IE_IRQ4
li a0, JAZZ_TIMER_IRQ
jal do_IRQ
move a1,sp
mfc0 t0,CP0_STATUS # disable interrupts again
ori t0,1
xori t0,1
mtc0 t0,CP0_STATUS
j ret_from_irq
nop
/*
* CPU count/compare IRQ (unused)
*/
ll_count: j ret_from_irq
mtc0 zero,CP0_COMPARE
#if 0
/*
* Call the handler for the interrupt
* (Currently unused)
*/
call_real: /*
* temporarily disable interrupt
*/
mfc0 t2,CP0_STATUS
and t2,s1
mtc0 t2,CP0_STATUS
nor s1,zero,s1
jal do_IRQ
/*
* reenable interrupt
*/
mfc0 t2,CP0_STATUS
or t2,s1
mtc0 t2,CP0_STATUS
j ret_from_irq
#endif
.data
PTR ll_sw0 # SW0
PTR ll_sw1 # SW1
PTR ll_local_dma # Local DMA
PTR ll_local_dev # Local devices
PTR ll_isa_irq # ISA IRQ
PTR ll_isa_nmi # ISA NMI
PTR ll_timer # Timer
ll_vectors: PTR ll_count # Count/Compare IRQ
/*
* Interrupt handlers for local devices.
*/
.text
.set reorder
loc_no_irq: PANIC("Unimplemented loc_no_irq handler")
/*
* Parallel port IRQ
*/
loc_parallel: li s1,~JAZZ_IE_PARALLEL
li a0,JAZZ_PARALLEL_IRQ
b loc_call
/*
* Floppy IRQ
*/
loc_floppy: li s1,~JAZZ_IE_FLOPPY
li a0,JAZZ_FLOPPY_IRQ
b loc_call
/*
* Sound IRQ
*/
loc_sound: PANIC("Unimplemented loc_sound handler")
loc_video: PANIC("Unimplemented loc_video handler")
/*
* Ethernet interrupt handler
*/
loc_ethernet: li s1,~JAZZ_IE_ETHERNET
li a0,JAZZ_ETHERNET_IRQ
b loc_call
/*
* SCSI interrupt handler
*/
loc_scsi: li s1,~JAZZ_IE_SCSI
li a0,JAZZ_SCSI_IRQ
b loc_call
/*
* Keyboard interrupt handler
*/
loc_keyboard: li s1,~JAZZ_IE_KEYBOARD
li a0,JAZZ_KEYBOARD_IRQ
b loc_call
/*
* Mouse interrupt handler
*/
loc_mouse: li s1,~JAZZ_IE_MOUSE
li a0,JAZZ_MOUSE_IRQ
b loc_call
/*
* Serial port 1 IRQ
*/
loc_serial1: li s1,~JAZZ_IE_SERIAL1
li a0,JAZZ_SERIAL1_IRQ
b loc_call
/*
* Serial port 2 IRQ
*/
loc_serial2: li s1,~JAZZ_IE_SERIAL2
li a0,JAZZ_SERIAL2_IRQ
b loc_call
/*
* Call the interrupt handler for an interrupt generated by a
* local device.
*/
loc_call: /*
* Temporarily disable interrupt source
*/
lhu t2,JAZZ_IO_IRQ_ENABLE
and t2,s1
sh t2,JAZZ_IO_IRQ_ENABLE
nor s1,zero,s1
jal do_IRQ
/*
* Reenable interrupt
*/
lhu t2,JAZZ_IO_IRQ_ENABLE
or t2,s1
sh t2,JAZZ_IO_IRQ_ENABLE
j ret_from_irq
/*
* "Jump extender" to reach spurious_interrupt
*/
3: jal spurious_interrupt
j ret_from_irq
/*
* Vectors for interrupts generated by local devices
*/
.data
local_vector: PTR loc_no_irq
PTR loc_parallel
PTR loc_floppy
PTR loc_sound
PTR loc_video
PTR loc_ethernet
PTR loc_scsi
PTR loc_keyboard
PTR loc_mouse
PTR loc_serial1
PTR loc_serial2
|
